GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 2 of 2
  1. #1

    Default Rough Idling and Heavy Exhaust Smell??

    I've got a 1986 Silverado (gas) that has started idling rough. It starts up fine (a little rough until given strong gas), but after it warms up and is in gear, I can feel it idling rough. Also, I've noticed that it seems to be putting off a heavier exhaust smell now. It doesn't generally stall, just idles rough. When not idling, it runs like it should.

    I assume it just needs a overall tune up (plugs, wires, etc), but I'm just trying to see if there's anything else that it could be too. Many thanks in advance!

  2. #2
    Legend
    stephan's Avatar
    Join Date
    Sep 2010
    Location
    Far West, Oregon USA,
    Posts
    8,606
    Blog Entries
    1

    Default

    Welcome to the GM truck club. By "heavy exhaust smell" do you mean "fuel rich smell" like unburned fuel in the exhaust? You are probably on the right track with a good tune up. Be sure & check the compression when you have the plugs out. Also be sure & check the air filter & the PCV valve when you do your tune, & take a good look inside the distributor cap. If there is any carbon tracking or corrosion on the terminals be sure & replace it & the rotor. They are cheap insurance compared to wasted time chasing an engine miss.

    '86 had a mix of TBIs' & carbs. What does yours have.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol


Similar Threads

  1. Egine runs rough while idling
    By Bear945 in forum General Chevy & GM Tech Questions
    Replies: 4
    Last Post: 09-12-2009, 03:21 PM
  2. Rough idling in Park or Neutral
    By willbradfan in forum GM Powertrain
    Replies: 8
    Last Post: 05-14-2009, 02:23 PM
  3. Idling rough....
    By hairysox33 in forum GM Powertrain
    Replies: 2
    Last Post: 02-02-2009, 03:26 PM
  4. 2005 tahoe idling rough
    By zach91 in forum GM Powertrain
    Replies: 4
    Last Post: 01-25-2008, 03:39 PM
  5. 92 Burban w/350 idling alittle rough
    By jbird in forum Chevy Suburban Forum (GMC Yukon XL)
    Replies: 4
    Last Post: 01-23-2008, 08:39 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •